Arrowman has some excellent advice. Wb likes slightly sftiffer arrows, and trimming helps. I have setup and tuned a lot of bows with this rest and once you understand it, everything should go well. Read my review of the rest it may help. If you have major clearance issues try going to 4 3" feathers This is what I am shooting this year with excellent results.
http://www.broadheadtests.com/ARROWRESTS.html